20 to 85, or 20/85 can be reduced to 4/17, which is the same as 4:17.
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20-3 = 17 and 17/20 = 85/100 = .85 or 85%. Percent is a ratio per cent or 100. Multiplying both the 20 and the 17 by 5 will make the denominator 100 and the percent sought after.
85 to 18 or 85:18 or 85over18
20 off percent 85 = 6820% off of 85= 20% discount applied to 85= 85 - (20% * 85)= 85 - (0.20 * 85)= 85 - 17= 68
20% of 85
85/100 or 17/20= 85% /100%= 85/100 or 17/20